Is your feature request related to a problem? Please describe.
If you send a Message popup to a player. After some cases the message is not valid, you should able help them to remove it.
the float fadeout time with 0f, and a null message won;t work ,it shows a blank forever Message popup

Describe the solution you'd like
A function to turn off specific player.SteamID if it has one.
Describe alternatives you've considered
if msg = null or fadeout = 0f, close player's msg.
Additional context
N/A